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TI-2026-38656 Aliases CVE-2026-53599GHSA-98pp-vccm-qm25

Unrestricted file upload in redaxo core

Priority HIGH 68CWE-434Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-434.

Summary

REDAXO is a PHP-based content management system. From 5.18.2 until 5.21.1, rex_mediapool::isAllowedExtension in redaxo/src/addons/mediapool/lib/mediapool.php lets an authenticated backend user with media[upload] permission upload a JPEG/PHP polyglot named shell.php.any.jpg, which web servers with multi-extension PHP handlers can execute as the web-server user. This issue is fixed in version 5.21.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00508 43rd percentileScored 2026-11-07
Fix Fixed core (redaxo): 5.21.1redaxo/source (Packagist): 5.21.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
redaxocore5.18.2 to before 5.21.15.21.1Patch availableCNA
—redaxo/source (Packagist)5.18.2 to before 5.21.15.21.1Patch availableGHSA-98pp-vccm-qm25
  • core Vendorredaxo Affected 5.18.2 to before 5.21.1 Fixed in 5.21.1 Patch available CNA
  • redaxo/source (Packagist) Vendor— Affected 5.18.2 to before 5.21.1 Fixed in 5.21.1 Patch available GHSA-98pp-vccm-qm25

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:redaxo:redaxo:*:*:*:*:*:*:*:*——redaxo
  • cpe:2.3:a:redaxo:redaxo:*:*:*:*:*:*:*:* Versions — — ·redaxo

Remediation

  • Fix · CNA core (redaxo) Fixed in 5.21.1
  • Fix · GHSA-98pp-vccm-qm25 redaxo/source (Packagist) Fixed in 5.21.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-53599
  2. 2026-10-03 Alias added: GHSA-98pp-vccm-qm25

References

Other 5

  • TI-2018-15578 Redaxo CMS Mediapool Addon 5.5.1 Arbitrary File Upload CVSS 4.0HIGH 8.7
  • TI-2026-17559 Redaxo has Path Traversal in Backup Addon Leading to Arbitrary File Read CVSS 4.0HIGH 8.3
  • TI-2025-39517 A Remote Code Execution (RCE) vulnerability in the template management component in… CVSS 3.1HIGH 7.2
  • TI-2024-30898 REDAXO CMS v2.11.0 was discovered to contain a remote code execution (RCE) vulnerability. CVSS 3.1HIGH 7.2
  • TI-2024-30896 An arbitrary file upload vulnerability in the MediaPool module of Redaxo CMS v5.17.1… CVSS 3.1HIGH 7.2
  • TI-2024-16680 Redaxo v5.15.1 was discovered to contain a remote code execution (RCE) vulnerability via… CVSS 3.1HIGH 7.2
See all 48 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences